Cookie preferences
We use cookies for analytics. Privacy Policy You can accept or decline non-essential tracking.
Convert ISO 8601 date strings (YYYY-MM-DDTHH:mm:ssZ) to Unix timestamps in seconds and milliseconds instantly.
> Convert Unix timestamps, ISO 8601 strings, and browser date values locally.
> Switch between seconds and milliseconds, inspect UTC vs local time, and copy stable outputs without guesswork.
Timestamp parsing and formatting happen in your browser. Nothing is uploaded or sent to a server.
Adjust a parsed local datetime value and convert it back into Unix and ISO formats instantly.
ISO 8601 is the international standard for representing dates and times: 2023-11-14T22:13:20Z. When working with databases, APIs, and JWT tokens, you often need to convert ISO date strings to Unix timestamps. The formula: Math.floor(new Date('2023-11-14T22:13:20Z').getTime() / 1000) gives 1700000000. Our converter handles any valid ISO 8601 string with or without timezone offsets, outputting both seconds and milliseconds.
The Z suffix stands for 'Zulu time', which is UTC+0. An ISO date with Z (like 2023-11-14T22:13:20Z) has no timezone offset. Without Z, the date is interpreted in local time, which can cause subtle timezone bugs.
Cron Validator
Validate cron expressions, see next run times, and field breakdown.
JSON Formatter
Validation, formatting and syntax highlighting for JSON.
Base64
Encode and decode text to/from Base64 format with UTF-8 support.
JWT Decoder
Decode JWT header and payload locally, inspect exp/iat/nbf claims, and debug bearer tokens without uploading them.